The state of Oregon has not just one, but two of the smallest municipal parks in the whole world. The first, Waldo Park in Salem, is only 3.6 by 6 metres and only contains a plaque, and a giant sequoia. Yes, one of the world’s smallest parks contains an example of the largest type of tree on the face of the planet. Mill Ends Park in nearby Portland is contained within a circle 61cm across, which sadly makes it almost completely invisible on the Google satellite shot (Look closely however, it’s situated right inbetween the two roads, and…